Improvement in drilling-machines



WILLIAM GARDAM 81,1. GARDAM. Sheets-'Sheen' Improvement in DrillingMachines. No. 123,8866. Patented Feb.20,1a72.

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n 2Sheets Sheet2 WILLIAM GARDAM 8L I. GARDAM. Improvement in DrIIIingMachines.

No. 123,8806. TMNT Pafe'ntedfeb. 2o, 1872.

gww Za/ww@ e l /MMZM UNITED STATES PATENT OEEICEo WILLIAM GARDAM ANDJOSEPH GARDAM, OF WILLIAMSBURG, NEW YORK.

IMPROVEMENT IN DRlLLlNG-MACHINES.

Specication forming part of Letters Patent No. 123,886, dated February20, 1872. I

' SPECIFICATION.

We, WILLIAM GAEDAM and JOSEPH GAE- DAM, of Williamsburg, county of Kingsand State of N ew York, have invented certain new and usefulImprovements in Drillin g-Machines, of which the following is aspecication:

Our invention relates to an improvement in drilling-machines; and itconsists of the addition, to an adjustable belt-tightening device, of ascrew-threaded extension to the axle of the tightening-pulley, as willhereinafter be more fully set forth.

Figure l, in the accompanying drawing, is a side view of our invention,and Fig. 2 is a rear view of the same.

The main frame a is provided with a bearing, a1, for the stem of thetable h to work iu, said table being held at any desired height by theset` screw h. The main frame is also provided with bearings a2 a3 at theupper part, which are in line with the bearing al. Between the bearingsa2 a3 is placed the pulley d, which gives motion to the drill-spindle c,by means of a longitudinal groove in the spindle e and a pin or featherin the pulley d working therein, so the spindle c is free to move up ordown. The drill-spindle c is moved to or from the work on the table h bythe hand-lever e, which is pivoted to the cap e1 on the top of thespindle c, and to two links, f and f', the other ends of the links beingpivoted to the projection a4 from the main frame a, forming the fulcrumof the lever e. The spring e2, fastened to the 1ever e and the mainframe a, is to raise the drill-spindle o from the table h. The twopulleys, g and g1, are for guiding the belt h onto the pulley d. Theyare on the sliding bracket g2, which may be moved out to tighten thebelt when it gets slack, and retained by the thumb-screw z'. The drawingshows the position of the sliding bracket g2 when the belt h is beingguided from a pulley beneath the table, to adjust it so as to run themachine from a pulley above. The sliding bracket is placed in the holeshown by dotted lines at a5. The guide-pulleys would then be in theposition shown by the dotted lines h. The spindle z, on which theguide-pulleys g and g1 are placed, is extended or lengthened, as Vshownat z', for the purpose of putting on polishing brushes, wheels, Ste. Thepulley g1 is fast to the spindle z, and consequently gives motion to it.The other pullejT g turns loose on it. The spindle z may be extended orlengthened on both sides of the machine.

We claim as our inventionrIhe addition to an adjustable belt-tighteningdevice of the screw-threaded extension to the axle of thetightening-pulley, as and for the purpose set forth.

WILLIAM GARDAM. JOSEPH GARDAM.

Witnesses W. HAUEF, E. F. KAsTENEUBER.

